Secondary stroke prevention and guideline adherent antithrombotic treatment in patients with atrial fibrillation: Insights from the Gulf Survey of atrial fibrillation events (Gulf SAFE)

Abstract

Background: Anticoagulation therapy in patients with atrial fibrillation (AF) is well established as effective thromboprophylaxis. However, AF patients with prior stroke are often treated with suboptimal antithrombotic treatment (ATT). In the present study, we investigated clinical characteristics and outcomes in AF patients with versus without prior stoke, in relation to guideline adherence in ATT.

Methods: We used data from the Gulf SAFE registry, which included patients with AF who presented to hospitals in Gulf countries of the Middle East. Adherence to guideline recommended ATT was assessed against the European Society of Cardiology guidelines.

Results: Of 1860 patients, 15.4% had a history of stroke (secondary stroke prevention). For secondary stroke prevention, 62.0% of patients were prescribed oral anticoagulants, while 27.9% were still prescribed antiplatelet therapy alone and 10.1% received no ATT. Overall, 49.0% were treated with guideline adherent ATT, 25.5% were undertreated, and 25.4% were overtreated. On multivariable logistic regression analysis, undertreatment (OR; 2.763, 95% CI; 1.426-5.352, p = 0.003) was significantly associated with an increased risk of 1-year stroke. On the other hand, overtreatment was significantly associated with an increased risk of 1-year bleeding (OR; 3.294, 95% CI; 1.517-7.152, p = 0.003).

Conclusions: Only half of the AF patients received optimal ATT for stroke prevention if we apply guideline recommendations. Guideline adherent ATT significantly reduced the risk of stroke and bleeding compared with non-guideline adherent ATT.

Keywords: Antithrombotic treatment; Atrial fibrillation; Guideline adherence; Secondary stroke prevention.